Process for the manufacture of barium oxid.



UNITED STATES PATENT oFmoE.

WALTER mnonnnn, or 'enfluao,

NEARB ERLIN, GERMANY, ASSIGNOR TO THE CHE- ms'onn FABBIK GR'UNAU Launsnorr AND MEYER, ax'rIENeEsELLscnAr'r', or

GB'UNAU, NEAR BERLIN, GERMANY.

' rnocnss ronfirrm ilmuracroan or BARIUM 0x115.

No Drawing.

Specification of Letters Patent. Application filed March 21, 1912. Serial No. 085,265.

Patented Dec. 10, 1912 rium carbonate or barium nitrate. It is well known to manufacturers that it is asimple matter to produce from the nitrate an oxid suitable for the. manufacture of a highgrade peroxid, viz: one containing about 90 per cent. of BaO but the production of an equally active oxid fromthc carbonate has hitherto seemed to be impracticable. The solution of this problem has been attempted by many investigators, but none of the processes hitherto known seem to have met with success, forthere is no barium peroxid in commerce, which has been produced from carbonate so. as to contain 90% of BaO I I have discovered, that it is 0111 'neces-' sary, to keep the carbonic acid of't cheating gases awayfrom the product of heating, in order to obtain barium-oxid of more than 90% strength. All other conditions, which have been considered injurious, such as moisture, unequal temperature, and acid nature of the crucible material, have no injurious effect on the formation of the barium oxid.

- This surprising iJ1vention=. is illustrated by the following example:

Example: A mixture of barium carbonate with about 6% of pine soot is introduced into an'absolutely s tight crucible,-

for instance a quartz cruel e, whose lid" has;

, been tightly mounted Bymeans of a fireproof cement, and which has a'smallvent" for the discharge of the gases whichare formed; The mixture maybe moist. The crucible preferably heated in a muflie for about 3 hours. The

1100" C. orhighen 'lfhe product obtained a friableand exceedingly .poru's. barium oxid containing onlytraces of carbonic acid.

,With water it reacts very violently and by suit-able oxidation it yields a peroxid of more than 90%. 'The crucible is affected only slightly if at all. iThis result isnew and unexpected, because under conditions, which hitherto were supposed to be unfavorable, a barium oxid of excellent quality was obtained.

The discovery/that it keep the carbonic acid of the heating gases perfectly gas-tight crucible, and the. fact shown to be erroneous represents a very important advance, inasmuch as it has shown new methods for the manufacture of barium oxid from the carbonate. I

The greatjvalue of the invention is due to the following facts: For the process of heating barium carbonate the manufacturer starting material, or to exactly 1 constant temperatures, of any special material. condition is necessary, viz: protection against the carbonic 1 acid of the heating gases,'the crucible or ovenmay be madeof anymaterial which is gas-tightat the temperature employed. Thesematerials include, in addition-to porcelain, quartz,.etc.,

in oint.

, hat I claim-is:

The process for the. manufacture of barium oxid from barium carbonate, which HGSSB'S.

. WALTER KIRCHNER.

'Witnes'ses:

Y Elm; FRANKE,

HENRY, Hams.

is only necessary to.

away from the'bariumoxid by the use of a.

that all previous assumptions are thereby is not restricted either to an anhydrous all refractory metals and alloys,,especially those kinds of iron which have a high meltconsists in heating the'barium carbonate in a receptacle made of material impervious torthe gases of combustion when the recepor to a crucible or oven made As only a single 

